Find the next number in the sequence

5 12 24 36 ?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

Can you count the number of lines in the below picture?

The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?

what does this below rebus represent identXQQQQQME

How many letters are in the alphabet?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Can you name some countries which do not have the alphabet 'A' in them?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

Solve the following series:
AZ, GT, MN, __, YB